My backstory for human!Pinkie: She never experienced anything like Rainbow Dash's Sonic Rainboom, so she's still in a deep depression. She only sees hard work in her future, without break and without joy. Her father was upset that she wasn't born male, so she tries to be that for him.
And then... Pinkie comes through the mirror.
She sees that her femininity is fine. She sees that the world does have joy. She sees that there is more to life than work.
Just one question (and I know I will get flamed for this) but; is this from a fan comic or the actual thing or something? Because I've been seeing the human version around a lot, but I haven't watched any of the MLP shows yet... So I'm wondering what this is off of so I can watch/read it.
Your drawing is awesome though, especially with the expressions.